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Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid

A fault ride-through and voltage source technology, applied in the direction of motor generator control, electronic commutation motor control, generator control circuit, etc., can solve the problem of not being able to guarantee the stability of the system when the characteristics outside the grid-connected point of the wind turbine are changed, and not being able to guarantee the stability of the weak grid Wind farm voltage stability and other issues

Active Publication Date: 2020-08-07
ZHEJIANG WINDEY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 3. Traditional virtual synchronous control
This invention only adopts a method of synchronous phase modulation. According to the above method, the voltage stability of the wind farm under the weak grid cannot be guaranteed, and the single synchronous phase modulation control method cannot ensure that the characteristics of the fan outside the grid-connected point change while avoiding the power angle. System stability problems caused by instability

Method used

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  • Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid
  • Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid
  • Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid

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Effect test

Embodiment 1

[0082] This embodiment is a voltage source type wind turbine fault ride-through control method suitable for weak grids, such as Figure 1-2 shown, including the following steps:

[0083] S1: Collect the effective value of the grid voltage, judge whether the fault ride-through condition is satisfied, if not, enter S2, and if yes, enter S3.

[0084] Wherein, the S1 fault ride-through condition specifically includes: the minimum value of the effective value of the three-phase grid voltage is smaller than the low-voltage ride-through threshold, or the maximum value of the three-phase grid voltage's effective value is greater than the high-voltage ride-through threshold.

[0085] S2: Calculation of control parameters in the voltage source control mode in the normal operating state, enter S7.

[0086] Among them, the normal voltage source control mode in S2 includes the following steps:

[0087] S21: The current operating mode is set to voltage source control under steady state; ...

Embodiment 2

[0135] This embodiment is a supplement to embodiment 1, such as image 3 As shown, the rotor-side converter 2 is connected to the grid-side converter 3, DFIG wind turbine and control strategy 1 respectively, the grid-side converter 3 is also connected to the grid, the grid is connected to the DFIG wind turbine, and the rotor-side converter The dq component of the rotor-side voltage output by the converter 2 generates a driving signal in the control strategy 1, and finally realizes the control of the rotor-side converter 2.

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Abstract

The invention discloses a voltage source type wind turbine generator fault ride-through control method suitable for a weak power grid, and overcomes the problems of unstable fault ride-through and grid connection of a doubly-fed fan under the condition of the weak power grid in the prior art. The method comprises two parts of control strategy switching and control strategy parameter calculation when a power angle is unstable under the condition of the fault ride-through. According to the invention, the voltage angle and amplitude of a fan port are controlled by using active current-frequency droop and reactive current-voltage droop; the external characteristics of a wind power plant can be changed from a PQ node (based on traditional vector control) to a V theta node; reactive current meeting the power grid standard can be provided under an asymmetric fault, the asymmetry degree of the power grid is reduced, the voltage stability after the fault is removed is enhanced, a Park conversion angle can be switched into a phase-locked loop angle when power angle instability occurs in the transient process, and the system stability problem caused by the power angle instability is avoided.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a system that can provide reactive current that meets grid standards under grid faults, enhance grid transient stability, effectively prevent grid voltage from falling again or even collapse after fault clearing, and strengthen power grid after fault clearing. Fault ride-through control method for voltage source wind turbines with high voltage stability and suitable for weak grids. Background technique [0002] In recent years, with the continuous expansion of the scale of wind power access and the continuous improvement of penetration rate, the strength of the power grid has gradually decreased. Under the condition of weak power grid, the fault ride-through performance of wind farms will directly affect the transient stability and voltage stability of the wind farm. [0003] Among the existing research results, the research on enhancing the fault ride-through capability and ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46H02J3/16H02P9/00H02P21/00H02P101/15
CPCH02J3/16H02J3/381H02P9/007H02P21/0003H02P2101/15H02J3/466H02J2300/28Y02E10/76Y02E40/30
Inventor 秦世耀洪敏应有李少林赖全怡法拉蒂尔
Owner ZHEJIANG WINDEY
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